Noun:
the metal bob of a plumb line
Adjective:
exactly vertical;the tower of Pisa is far out of plumb
Adverb:
completely; used as intensifiers;clean forgot the appointment
I'm plumb or plum tuckered out
conforming to the direction of a plumb lineexactly;fell plumb in the middle of the puddle
Verb:
measure the depth of somethingweight with leadexamine thoroughly and in great depthadjust with a plumb line so as to make verticalvertical，perpendicular，upright，erect，plumb这些形容词均有“垂直的、竖式的”之意。
vertical指与平面、水平线或基线成直角或几乎成直角向上延伸至顶点的物体。也可指呈直线上升或下降的。
perpendicular指与水平线形成90度的线或面，或朝垂直方面延伸的，尤指向下的急剧运动。
upright普通用词，指竖立、笔直而不是倾斜、倒塌的。
erect指笔直挺拔，而非倾斜、佝偻、弯曲或倒塌的。
plumb建筑上用词，凭锤球评判某物是否完全垂直。
out of plumb不垂直plumb rule锤规plumb bob铅锤plumb line铅垂线plumb level铅垂水准器plumb joint焊接头plumb line deflection垂线偏差plumb pile垂直桩plumb point垂准点optical plumb光测悬线,光测垂线,…set plumb挂直rubber dam plumb橡皮障吊锤out off plumb不垂直的
近义词 face表面bang巨响plum李子true真实的undergo经历truly真实地totally完全plummet铅锤clean干净的erect使竖立upright直立的aligned对齐的exactly精确地plumb bob铅锤vertical垂直的understand懂得experience经验precisely精确地completely完全地comprehend充分理解perpendicular垂直的fathom英寻（=6英尺)…
名词100%
用作名词Bricklayers and carpenters often use plumb lines .瓦工和木工经常使用铅垂线。
The plumB line is always perpendicular to the horizontal plane.铅垂线总是垂直于水平面的。用作形容词用作副词The bullet hit him plumb between the eyes.子弹正好打在他的双眼之间。